随机实验是因果推理的黄金标准，但它们并不总是可行的。
"Randomized experiments are the gold standard for causal inference, but they are not always feasible."
The unfinished has its own perfection.
The streets were dark with something more than night.
"I write to escape the truth, but I always end up finding it."
理论洞察可以带来实际突破，弥合抽象思想与现实应用之间的差距。
